James macfablane



NTTEE STATES PATENT ERICE.-

JAMES MACEARLANE, or MALDEN, ASSICNCR, RY MESNE ASSIGNMENTS, To HIMSELE,AND CLARENCE FREDERICK JEwErr, or RRCCKLINE, MASS.

LET-OFF MECHANISNI FOR LOOIVIS.

SPECIFICATION forming part of Letters Patent No. 308,681, dated December2, 1884.

Application filed October 17, 1853.

TU ctZZ whom t may concern: l

Be it known th at I, JAMES MACFARLANE, o Malden,in the county ofMiddlesex, of the Gommonwealth of Massachusetts, have invented a new anduseful ImprovementinLet-Off Mechanisms for Looms; andl do hereby declarethe same to be described in the following specification and representedin the accompanying drawings, of which- Figure 1 is an elevation, partlyin section, and Fig. 2 an end view, also partly in section, showing awarp-beam and the improved let-off mechanism. Fig. 3 is a longitudinalsection of one of the extensible bearing-rollers upon which thewarp-beam is Supported.

The nature of my invention is defined inthe Claims hereinafterpresented.

In Fig. 2 the letoff mechanism is shown as adapted to avertically-movable loom-lay, (a lay of such description being shown inthe drawings of the United States Patent No. 278,7155) but it is equallyapplicable to ahori- V zontally moving or vibratory lay of a commonloom, the lay shown at Abeing provided with a suitable pawl, a, to bereciprocated by it in a manner to'cause such pawl to engage withtheteeth of the ratchetwhecl B of the let-oli' mechanism, andintermittently revolve the said wheel to the necessary extent. Restingon the serrated periphery of the ratchet-wheel is one or moreretaining-pawls, b, pivoted to the standard c, extending upward from theloom-frame C. The warp-beannloaded with yarn, as shown at D, is providedat its opposite ends'with journals d d, each of which is shown asextending between the two prongs c e of one of two adjustableguide-forks, E E. These guide-forks rest on two slotted brackets, F F,and are adjustable thereon nearer to or farther from each otherrectilinearly in order to adapt them to warp-beams of different lengths,as may be required. From each fork E a screw, f, extends down throughthe slot g in the bracket, such screw having a nut, h, screwed upon itand against the under side of the bracket. The yarn load of the warpbeamrests circumferentially upon two supporting and extensible rollers, G G,arranged horizontally and parallel with each other and at a suitabledistance apart. Each of these rollers consists of along cyli11der,f,twoshorter cylinders, k 7c, and two thimbles, Z Z, arranged as shown inFigs. l and 3, and adapted to two shafts or spindles, m m, arranged withtheir u axes in one straight line. The median or longest cylinder i hasthe two spindles or shafts extending into it axially and conceirtrically, as represented, it being connected to such shafts or spindlesby a spline or feather Connection, to enable each of them to slide 6olengthwise in it, (the said cylinder.) Each of the auxiliary or lessercylinders 7c 7a is applied inthe same manner to one of the spindles,there being on one of the spindles, and between the median and one ofthe lesser cylinders, a spurgear, m, which `is also applied to thespindle by a feather-connection. Each thimble Z has a diameter equal tothat of the cylinder z', and encompasses and fits to one of thecylinders k, and consists of a tube, a, and a wheel or head, o, thelatter being inserted in such tube at one end thereof and fastened toit. A set-screw, p, screwed through the hub of the wheel o and againstthe spindle, serves to conne such wheel to the spindle.

From the above it will be seen that each thimble can be moved lengthwiseupon its sustaining-roller, so as to increase the length of the roller Gasawarpbeam to rest on it may require, the spindle of the thimble beingmov- 8c able at the -same time in the cylinder t' and one of thecylinders k. The two spindles rest in bearings in two stationarystandards, o' r, extending up between the median and secondary cylindersof each roller G,whose gear, m', 85 engages with the terminal gear a ofa train,

n', o', and p', in Connection with and driven by the ratchet-wheel B.

From the above it will be seen that the extensible bearing-rolls G Gwill be revolved 9o intermittent-ly at a uniform speed as the lay may bein movement, and consequently, as the load of the warp-beam restsdirectly ou the said two rollers, such load will be revolvedso as tocause its warp-yarns to be delivered or let off at a uniform rate, asmay be required.

The loom is to be supposed to be calculated for weaving cloth of anywidth between certain adopted extremes-as from a yard and a 10o half totwo yards, for example. By having -each roller G extensible, as setforth, it can be adapted to any Warp-beam that can be used tially asrepresented, arranged and provided in the loom, Whatever may be thelength of with mechanism for intermittently revolving the load of yarnof such beam. them, as and for the purpose specied.

'What I claim is as follows, viz: 3. The extensible roller G, composedof the 15 5 1. The combinationy of extensible rollers, three cylinders,the two spindles, and the two substantially as described, with mechanismthimbles, constructed, arranged, and adapted for intermittentlyrevolving them, as set forth, l substantially as set forth.

and a Warp-beam, as explained. Y JAMES MA CFARLANE. 2. The combinationof two guide-forks, E, 'Vitnesses: Io adjustable as described, with aWarp-beam, R. H. EDDY,

and With tivo extensible rollers, Gr, substan- S. N. PIPER.

